Which type of extinguisher is most effective for grease fires?

The most effective type of extinguisher for grease fires is indeed the Type B fire extinguisher. Type B extinguishers are specifically designed to handle flammable liquids, including oils and greases, which are the primary culprits in kitchen fires. When using a Type B extinguisher, the extinguishing agent works by smothering the flames and cutting off the oxygen supply, effectively putting out the fire.

Type A extinguishers are more suitable for ordinary combustibles such as wood, paper, and cloth, making them ineffective against flammable liquids. Type C extinguishers are focused on electrical fires, which would not be useful in the case of a grease fire. Type D extinguishers are intended for combustible metals, which are unrelated to grease fires typically encountered in kitchen environments. Thus, the Type B fire extinguisher is specifically designed to combat the unique hazards associated with grease fires, making it the best choice in such situations.